航空材料学报2024，Vol.44Issue(6)：90-96,7.DOI:10.11868/j.issn.1005-5053.2024.000032
A100超高强度钢腐蚀疲劳裂纹扩展拘束效应研究
Constraint effect on corrosion fatigue crack growth behavior of A100 ultrahigh strength steel
摘要
Abstract
Ultrahigh strength steel has been widely used to manufacture aircraft landing gear and other load-bearing structures,which is prone to corrosion fatigue failure when serving in harsh marine environment.The fatigue crack propagation behavior of small-sized samples in laboratory is different from that of actual structures due to constraint effect.The fatigue crack propagation tests of A100 ultra-high strength steel in air,neutral and acidic seawater are carried out using single edge tension specimens with different crack depths and specimen thickness.The results show that with the increase of crack depth and sample thickness,the constraint level of crack tip increases,the fatigue crack growth resistance decreases,and the crack growth rate accelerates.The combined effect of constrains and corrosion environment significantly accelerate the fatigue crack growth rate of A100 ultrahigh strength steel.As the amplitude of stress intensity factor ΔK equals to 30 MPa·m1/2,a good positive correlation between constraint parameters and corrosion fatigue crack growth rate can be observed.The relevant research results can provide reference for the service life assessment of ultrahigh strength steel structures in marine environment.关键词
A100超高强度钢/拘束效应/腐蚀疲劳/裂纹扩展Key words
A100 ultrahigh strength steel/constraint effect/corrosion fatigue/crack propagation分类
航空航天引用本文复制引用
李一哲,黄海亮,卞贵学,王安东,王玺..A100超高强度钢腐蚀疲劳裂纹扩展拘束效应研究[J].航空材料学报,2024,44(6):90-96,7.基金项目
山东省高等学校"青创团队计划"(2022KJ082) （2022KJ082）
